Programmable telephone switcher
US4674115A · kind A · utility
130Cited by
22References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1985 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Sep 20, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/914
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The programmable telephone screening device routes an incoming call to a selected telephone device, depending on preestablished device priorities and upon access codes dialed by the caller. The device provides call hold, call forwarding and automatic dialing and is capable of testing the telephone utility network to determine DTMF and pulse dialing compatability. The device generates ringer signals for directly energizing the ringer circuits of standard telephone devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.